生物质化学工程2025，Vol.59Issue(6)：54-64,11.DOI:10.3969/j.issn.1673-5854.2025.06.007
纤维素纳米晶体/聚乳酸复合材料的制备及性能
Preparation and Properties of Cellulose Nanocrystal/Polylactic Acid Composites
摘要
Abstract
To address issues such as poor barrier properties,insufficient mechanical strength,and inadequate thermal stability of polylactic acid(PLA),and realize the effective utilization of waste resources of printing and packaging,cellulose nanocrystals were extracted from office waste paper,and cellulose nanocrystal/polylactic acid(CNC/PLA)composites were prepared by solution casting method.The effects of CNC on the structure,morphology,and properties of PLA were investigated by SEM,FT-IR,XRD,TG,and DSC,and the modification mechanism of CNC was revealed.The results showed that CNC had a cellulose type Ⅰ structure,and its compounding with PLA was merely a simple physical mixture,which did not alter the chemical structure of PLA.However,its filler reinforcement effect could significantly improve the mechanical properties of PLA.When the addition amount was 1％,the tensile strength,elongation at break,and folding times of CNC/PLA1 increased from 43.44 MPa,1.8％,and 153 times of PLA to 93.54 MPa,2.9％,and 502 times,respectively.CNC could form thermal conduction pathways in PLA.When the addition amount was 2.5％,the initial thermal decomposition temperature of CNC/PLA2.5 increased from 304 ℃ of PLA to 324 ℃.Additionally,adding CNC extends the diffusion path of water molecules in PLA,reduces material defects and surface roughness of PLA,reduces water vapor permeability and improves material transparency,and promotes soil burial degradation reactions.When the addition amount of CNC was 1％,the water vapor permeability of CNC/PLA1 decreased from 788.54 g/(m2·d)of PLA to 644.67 g/(m2·d),and the light transmittance and soil burial degradation rate at a wavelength of 600 nm increased from 80％and 1.09％to 95％and 3.83％,respectively.关键词
纤维素纳米晶体/聚乳酸/复合材料/废纸Key words
cellulose nanocrystal/polylactic acid/composites/waste paper分类
化学化工引用本文复制引用
雷婉青,周琛,胡京博,贾普友,李露,周星..纤维素纳米晶体/聚乳酸复合材料的制备及性能[J].生物质化学工程,2025,59(6):54-64,11.基金项目
国家自然科学基金资助项目(52372093) （52372093）
陕西省重点研发项目(2023GXLH-045) （2023GXLH-045）
轻化工助剂化学与技术教育部重点实验室/陕西省轻化工助剂化学与技术协同创新中心开放课题(KFKT2024-05) （KFKT2024-05）
